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Aqueous-phase preparation method of bismuth sulfide/protein composite nanospheres

A protein composite and aqueous phase preparation technology, which is applied in the field of aqueous phase preparation of bismuth sulfide/protein composite nanospheres, can solve the problems of unstable product shape, unfavorable later application, easy agglomeration into large pieces, etc., and achieve short preparation cycle , easy to implement, and simple experimental equipment

Inactive Publication Date: 2015-09-02
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] The present invention mainly proposes a water-phase preparation method of bismuth sulfide / protein composite nanospheres, which solves the need for high-temperature heating in the prior art, and the shape of the obtained product is not fixed, and it is easy to agglomerate into large pieces, which is not conducive to later application and other technical issues

Method used

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  • Aqueous-phase preparation method of bismuth sulfide/protein composite nanospheres
  • Aqueous-phase preparation method of bismuth sulfide/protein composite nanospheres
  • Aqueous-phase preparation method of bismuth sulfide/protein composite nanospheres

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Embodiment 1

[0027] The first step: add 2.5 mmol of mannitol to 25 mL (10 mg / mL) aqueous solution of bovine serum albumin. The purity of the bovine serum albumin is >98% and the molecular weight is 68000. After stirring and dissolving at room temperature, add 1 mmol of bismuth nitrate pentahydrate particles, stirring and dissolving for 10 min at room temperature to form a mixed solution containing bismuth ions and protein;

[0028] The second step: 5 mL (300 mmol / L) thioacetamide solution was slowly added dropwise to the mixture of bismuth ion protein, and stirred at room temperature for 5 min to form a mixture of bismuth-sulfur bovine serum albumin;

[0029] The third step: put the bismuth-sulfur bovine serum albumin mixture in a 35 ℃ water bath and heat for 2 h, and then centrifuge the black solid obtained by centrifugation. After vacuum drying for 12 h, bismuth sulfide / protein composite nanospheres were prepared.

[0030] The experimental results show that the obtained bismuth sulfide / ...

Embodiment 2

[0032] Step 1: Add 1 mmol of bismuth nitrate pentahydrate particles to 25 mL (10 mg / mL) bovine serum albumin aqueous solution, and stir and dissolve for 10 min at room temperature;

[0033] The second step: 5 mL (300 mmol / L) of thioacetamide solution was slowly added dropwise to the above mixed solution, and stirred at room temperature for 5 min to form a bismuth-sulfur bovine serum albumin mixed solution.

[0034] The experimental results show that in the absence of mannitol, the bismuth ion is easily hydrolyzed into a white solid insoluble matter, resulting in the reaction not continuing normally.

Embodiment 3

[0036] Step 1: Add 2.5 mmol of mannitol to 25 mL of deionized water, stir and dissolve at room temperature, add 1 mmol of bismuth nitrate pentahydrate particles, stir and dissolve at room temperature for 10 min to form a solution containing bismuth ions;

[0037] The second step: slowly drop 5 mL (300 mmol / L) thioacetamide solution into the solution containing bismuth ions, and stir at room temperature for 5 min to form a bismuth-sulfur mixed solution;

[0038] The third step: put the bismuth-sulfur mixture in a water bath at 35°C for 2 h, and then perform centrifugation. The black solids obtained by centrifugation were washed three times with deionized water and ethanol, respectively, and then vacuum-dried at 30°C. 12 h, bismuth sulfide nanomaterials were prepared.

[0039] The experimental results show that bismuth sulfide nanomaterials can still be synthesized without bovine serum albumin, but the obtained products have different sizes, larger particle sizes, poor dispersio...

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Abstract

The invention discloses an aqueous-phase preparation method of bismuth sulfide / protein composite nanospheres. Mannitol is used as ligand, and the bismuth sulfide / protein composite nanospheres are prepared for the first time in an aqueous phase under room temperature condition. The prepared bismuth sulfide / protein composite nanospheres have characteristics of porous structure, large specific area, uniform shape, controllable size, low biological toxicity and the like, can be used as a biological medical probe and have potential application prospect in the medical imaging aspect such as CT. The method is simple in devices, moderate in condition, low in energy consumption, short in preparation period, easy to realize and is an ideal method for preparing a bismuth sulfide / protein composite nano material.

Description

technical field [0001] The invention relates to a water-phase preparation method of nanocomposite materials, in particular to a water-phase preparation method of bismuth sulfide / protein composite nanospheres. Background technique [0002] With its high surface activity, unique optical, electrical, magnetic properties, and extremely small three-dimensional structure, nanomaterials adapt to the current development trends of ultra-micronization, high-density integration, and low energy consumption of components, while metal oxide semiconductor nanomaterials Materials are an important part of nanomaterials. Scientists have studied various methods to synthesize metal oxide semiconductor nanomaterials with various shapes. [0003] Bismuth sulfide is an important semiconductor material with potential applications in thermoelectric, electronic and optoelectronic devices and infrared spectroscopy. Its forbidden band width is 1.2~1.7eV, which can be used to make photoelectric conver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00C07K14/765C07K14/805
Inventor 沈清明樊晓慧范曲立黄维
Owner NANJING UNIV OF POSTS & TELECOMM
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